Disk Space Fan is a freeware and it is a nice disk space analysis tool for Windows. It helps you to free up disk space by quickly finding and deleting big, useless files. It displays disk space usage with a nice chart. You can navigate the folders easily with the chart. It is also intergrated with Windows Explorer to open, delete and browse files or folders.
Disk Space Fan is on lifehacker.com
Addictivetips.com reviewed Disk space fan.
49 Reasons introduces Disk Space Fan on their web site."All in all it's a pretty nifty program that will analyze all of your drives including a CD/DVD." Link
Downloadtube.com made a nice install tutorial for Disk Space Fan.Link